[INFO] cloning repository https://github.com/panicbit/rust2dart
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/panicbit/rust2dart" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpanicbit%2Frust2dart", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpanicbit%2Frust2dart'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9184f85329ce684ee2c4f4b67c207ee201152224
[INFO] building panicbit/rust2dart against master#0da281b6068a7d889ae89a9bd8991284cc9b7535 for pr-103610
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpanicbit%2Frust2dart" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/panicbit/rust2dart on toolchain 0da281b6068a7d889ae89a9bd8991284cc9b7535
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0da281b6068a7d889ae89a9bd8991284cc9b7535" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/panicbit/rust2dart
[INFO] finished tweaking git repo https://github.com/panicbit/rust2dart
[INFO] tweaked toml for git repo https://github.com/panicbit/rust2dart written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/panicbit/rust2dart already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0da281b6068a7d889ae89a9bd8991284cc9b7535" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:83125433e4fff17b1ac56874832f668d9df75ee638575aca552b68e127bedee9" "/opt/rustwide/cargo-home/bin/cargo" "+0da281b6068a7d889ae89a9bd8991284cc9b7535" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9d1404906db239ca6e3d317dc0f4419be4bd50a1b817b1e6eefd82ed06455fa
[INFO] running `Command { std: "docker" "start" "-a" "a9d1404906db239ca6e3d317dc0f4419be4bd50a1b817b1e6eefd82ed06455fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9d1404906db239ca6e3d317dc0f4419be4bd50a1b817b1e6eefd82ed06455fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9d1404906db239ca6e3d317dc0f4419be4bd50a1b817b1e6eefd82ed06455fa", kill_on_drop: false }`
[INFO] [stdout] a9d1404906db239ca6e3d317dc0f4419be4bd50a1b817b1e6eefd82ed06455fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:83125433e4fff17b1ac56874832f668d9df75ee638575aca552b68e127bedee9" "/opt/rustwide/cargo-home/bin/cargo" "+0da281b6068a7d889ae89a9bd8991284cc9b7535" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 192634665dcd799eb6fd953b80f1e4cee4a2e14b5485fa139b46e1d99664ed5a
[INFO] running `Command { std: "docker" "start" "-a" "192634665dcd799eb6fd953b80f1e4cee4a2e14b5485fa139b46e1d99664ed5a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling anyhow v1.0.55
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling itertools v0.10.3
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr] thread '<unnamed>' panicked at 'assertion failed: pos.get() <= self.position()', compiler/rustc_metadata/src/rmeta/encoder.rs:426:9
[INFO] [stderr] error: could not compile `syn`
[INFO] running `Command { std: "docker" "inspect" "192634665dcd799eb6fd953b80f1e4cee4a2e14b5485fa139b46e1d99664ed5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "192634665dcd799eb6fd953b80f1e4cee4a2e14b5485fa139b46e1d99664ed5a", kill_on_drop: false }`
[INFO] [stdout] 192634665dcd799eb6fd953b80f1e4cee4a2e14b5485fa139b46e1d99664ed5a